Etymology
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Borussia 
alternative form of Prussia (q.v.).
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spruce (n.)
1660s, "evergreen tree, fir," from spruse (adj.) "made of spruce wood" (early 15c.), literally "from Prussia," from Spruce, Sprws (late 14c.), unexplained alterations of Pruce "Prussia," from an Old French form of Prussia.

Spruce seems to have been a generic term for commodities brought to England by Hanseatic merchants (especially beer, boards and wooden chests, and leather), and the tree thus was believed to be particular to Prussia, which for a time was figurative in England as a land of luxuries. Compare spruce (adj.).

As a distinct species of evergreen tree from 1731. Nearly all pines have long, soft needles growing in groups of two (Scotch) to five (white); spruce and fir needles grow singly. Spruce needles are squarish and sharp; fir needles are short and flat. Cones of the fir stand upright; cones of a spruce hang before falling.
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Prussian 

1550s (n.), "native or inhabitant of Prussia;" 1560s (adj.), "of or pertaining to Prussia;" from Prussia + -an. In reference to the language of the earlier inhabitants of (East) Prussia, which was closely related to Lithuanian, by 1888. It was spoken between the lower Vistula and the Niemen and was extinct by the end of 17c.  Prussian blue pigment (1724) came to English from French bleu de Prusse, so called for being discovered in Berlin, the Prussian capital.

All in all, it seems that Prussian blue was synthesised for the first time around 1706 by the Swiss immigrant Johann Jacob Diesbach in Berlin. [Jens Bartoll and Bärbel Jackisch, "Prussian Blue: A Chronology of the Early Years," in Zeitschrift für Kunsttechnologie und Konservierung 24, No. 1, 2010]

Early German sources refer to it as Preußisches Ultra-Marin and berliner blau. Prussic acid (1790), is from French acide prussique, so called in reference to Prussian blue pigment, to which it is chemically related.

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Pomeranian (n.)

type of small Spitz-type dog, 1760, from Pomerania, former province of Prussia on the south coast of the Baltic Sea.

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hegemonist (n.)
"one who advocates a political policy of hegemony," 1898 (in reference to Prussia in Germany); see hegemony + -ist.
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spruce (adj.)
"neat, smart in dress and appearance, dapper, brisk," 1580s, from spruce leather (mid-15c.; see spruce (n.)), a type of leather imported from Prussia in the 1400s and 1500s which was used in England to make a popular style of jerkin that was considered smart-looking.
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homburg (n.)
type of soft felt hat with a curled brim and a dented crown, 1894, from Homburg, resort town in Prussia, where it was first made. Introduced to England by Edward VII.
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Gestapo 
Nazi secret state police, 1934, from German Gestapo, contracted from "Geheime Staats-polizei," literally "secret state police," set up by Hermann Göring in Prussia in 1933, extended to all Germany in January 1934.
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psychographic (adj.)

also psycho-graphic, "of or pertaining to psychography," 1856, from psychograph "supernatural photographic image or device" (1854)  from psycho- + -graph. Also see psychography. Related: Psychographics.

—What next? Among the new patents announced is one to Adolphus Theodore Wagner, of Berlin, in the kingdom of Prussia, professor of music, for the invention of a "psychograph, or apparatus for indicating a person's thoughts by the agency of nervous electricity." [Arthur's Home Magazine, May 1854]
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grippe (n.)
"epidemic influenza," 1776, probably from French grippe "influenza," originally "seizure," verbal noun from gripper "to grasp, hook," from Frankish or another Germanic source, from Proto-Germanic *gripanan (see grip (v.), gripe (v.)). Supposedly in reference to constriction of the throat felt by sufferers; the word spread through European languages after the influenza epidemic during the Russian occupation of Prussia in the Seven Years' War (c. 1760), and Russian chirpu, said to be imitative of the sound of the cough, is sometimes said to be the origin or inspiration for the word.
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